I am using a raspberry pi to do various things. I installed OS 1 on my RPi a few weeks ago, established a hostname (I THINK), call it hostname1. I used a wifi adapter to connect to the internet for it (although possibly ethernet for initial setup).
I later decided I wanted to do something else, requiring a different OS, OS2. I also changed the hostname to hostname2 because I'm a child and wanted to call it "CutiePi" (aka hostname2). Now, the weird thing is that when I plug my Pi in with OS2 loaded and what I assume is hostname2, my router shows it as having hostname1. I also decided to change the MAC address in /etc/network/interfaces, and the router would show the original MAC address and hostname1.
Can anyone explain this behavior? Is there something that a router sees on a device that is independent of the OS installed that might be confusing it?